asp.net Cross-Page PostBack

Create  CrossPagePostBack.aspx

<%@ Page Language="C#" %>
<script runat="server">
</script>
<title>asp.net cross page postback example</title>
<form id="form1" runat="server">
<div>
<h2 style="color: red;">
asp.net Cross-Page PostBack example</h2>
<asp:label forecolor="DodgerBlue" id="Label1" runat="server" text="ProductID">
</asp:label>
<asp:textbox backcolor="DodgerBlue" forecolor="AliceBlue" id="TextBox1" runat="server">
</asp:textbox>
<asp:label forecolor="DodgerBlue" id="Label2" runat="server" text="Product Name">
</asp:label>
<asp:textbox backcolor="DodgerBlue" forecolor="AliceBlue" id="TextBox2" runat="server">
</asp:textbox> 
<asp:button font-bold="true" forecolor="DodgerBlue" id="Button1" postbackurl="~/NextPage.aspx" runat="server" text="Submit data"></asp:button></div>
</form>

Create  NextPage.aspx

<%@ Page Language="C#" %>
<script runat="server">
    protected void Page_Load(object sender, System.EventArgs e) {
        TextBox pvProductID = (TextBox)PreviousPage.FindControl("TextBox1");
        TextBox pvProductName = (TextBox)PreviousPage.FindControl("TextBox2");
        Label1.Text ="You came from: "+ PreviousPage.Title.ToString();
        Label2.Text = "Product ID: " + pvProductID.Text.ToString();
        Label2.Text += "
        Product Name: " + pvProductName.Text.ToString();

        string imageSource = "~/Images/" + pvProductID.Text + ".jpg";
        Image1.ImageUrl = imageSource;
        Image1.BorderWidth = 2;
        Image1.BorderColor = System.Drawing.Color.DodgerBlue;
    }
</script>
<title>asp.net Cross-Page PostBack example: how to submit a page to another page</title>
<form id="form1" runat="server">
<div>
<h2 style="color: teal;">
asp.net cross page postback example</h2>
<asp:label forecolor="Crimson" id="Label1" runat="server">
</asp:label>
<asp:label forecolor="SeaGreen" id="Label2" runat="server">
</asp:label>
<asp:image id="Image1" runat="server">
</asp:image></div>
</form>